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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2337ce481467fac21e027d361a80ee5536d754bd82d74823e113a203f06edc' 
  AND token = 'VzRO/4MqgzaW8Ycstu1jYR49H16Q9GnR/clrmg4Wvrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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