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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5cc7f0b000811c0b9921b77f9e0bebc1cbb7482f71a7934531ced58a4d7db4' 
  AND token = 'dce90xNe6IA54H0ZH4Kkt3MEYG9/A1MjC9k8OqbQfEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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