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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdf0c60189af1b17a0ad4a6f12a5aed2be375e2eb3a5e8adab003749bdbf11b' 
  AND token = 'XQWw5x2AJjCjEorj37IKFC6zmDtGpd5j36iKaQRXOIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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