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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a40230efaf625d9e43ccbbbdd601e46868261af0aab66696e8d63154ca492c7' 
  AND token = 'e3cGh5j6kIi1z15SeqEHjp27o2oZ3ecnJE2mIWuwwyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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