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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83838106a9c861463019be14c1976f1a36bb1946b8c92908b9dcb3fd289decc' 
  AND token = 'p3EuIN1vROYKCgVzU5XaR9XuSoYlCwZbAihYG31nyCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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