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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204c3efc10db634b855e02fadea75645a6e9d2ba5e75e0616615640fc0a76911' 
  AND token = 'mXc9HwYK+wOMy6RAvZPCDXC6OZmSjmzum1zA9cC1VaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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