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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1035e480de812875d26658c99aeb81a8ab06121df03f3403568f00c30f19a3' 
  AND token = 'f661cv9BqjvV5IGfA1ojr5qm32PdtbdjVB5vBFqsGS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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