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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fd8f39253e0ffe50f6e52271254c795d477e0a84b2ea46d74f622bb5ed7a45' 
  AND token = 'Ytkr56zFuoo5b1oRa+zijmk+HKPKS75aScff5jq4fs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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