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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f0daa52eb5c2139f47b905271e3d3c52c36fa60f7d710621a481e409a61b7a' 
  AND token = '5nR4BsvHd2nTETooOZdkV8IbreaJOy1nTWW4q+Y1JZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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