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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96f1f698b14f4f23a9554a25975bbf9b7da6a7be3abb51944d845297b73f8a4' 
  AND token = 'L0oEoGAEoWLBhxucL0OKlesmzZxi5Rqz0fJ5KKKv9ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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