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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4cffe45b38dc070011731a4be7ebf44a90b871a4fab8fddbcba9b9bfa5e5bd' 
  AND token = 'U9kzpRQhaVpCrVkpwclNNKLYNUsYaq4JNh5994/tnm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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