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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc384be78957cccd363e4766096f2881b6b6e188a581050d28c16c17ac672bdf' 
  AND token = 'R8EHqzkqZGACsgCx3B6q+HNUSzXkWcI1w9h36vWTkn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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