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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df00b8943fdbac7daa9ff45e2ada941545db20e685aa5697457d4d0d799b6d75' 
  AND token = 'rgKOX0oBeuOj6diQgI00vip9J7JRrE5R1QaNIZsn78k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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