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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ba1799190b9d850e793371915fb7a565f6fe2ba08743564910f0103a519d07' 
  AND token = 'i/h8LNZyCMVYXwtYY2sQWZuE5ghCoatxo3J7V3Bwkjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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