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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871f94aee867044555278c39abf1638437b404bd6bc8f889a9be4f53db877626' 
  AND token = '7pezXzFbFeOzKCmn1qp74rKMsPCvp/WRG4n/yl3xAIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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