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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179a1e97c6b26b195da75c53f814ec87d54dde8d3559c69f1758955f7696af9e' 
  AND token = '1xr4OFGpgy3wgXrhxDpXx8aIRW/Rr3y5nezLi2LmDPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}