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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a23e749bb1f22a9c6a43f1ad58d38edef48506c92a712b7f01c07a61bf38f7' 
  AND token = 'lquKncjUXiObZ/tok6qEU1lBptHlKHECYKeZIupTl1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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