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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48514c5d7f02846cd37bdda223525353005b1abf5f7a64c8b8b46039832719c9' 
  AND token = 'pBzxwj/66wpn3nPdyCrj1snd66AeIvv2TAimmZXDbu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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