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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4817360728430b1b4f4b14ad5be096121c1a183449ff8eb918a5a67eb9638f3' 
  AND token = 'Qox1Rbf9UzoYRpuiGgRN7QDMosDW9zHGC75ySLcyGb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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