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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b880a61406d4054cf7f4ba34fd491f50d2b62fa7b55e2ddbe329d4eba566696' 
  AND token = '7fPtUTKD1dnu+2uYFPqCOpyY5ZeQl8gytSSjI1E9z48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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