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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ca986a9b9869b4cb3efea058a3b1abd5137d6ac26cc494bbc555187ebc2d17' 
  AND token = 'odgDl5buQQmT9WrG23ACySLD0nrHCZJPuhuQavxe8/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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