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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90df810119bfda41b9d2996703c85f1de9114322349f8cf944d2a74a3a14937c' 
  AND token = '0R0Vq6d93aFpeUmyShVrEKHcyErVyKW6O34ZLGdoIss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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