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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb944ca9e583271bd775853d6baddba04b4dbac292a8874bed8b7ec91198207' 
  AND token = 'xOHI+G0ROOYaoJc2MKsWdpfbNCEnPp0aa44Bx20/84s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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