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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f71ef40615504fc219a68356102d6dc1fef67dee17c749d4a931a104a31a4c6' 
  AND token = 'WiA6+pD+YAjlB7bxW0Ad78jSeU9+nKrz37xvALQNJVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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