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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03d48a1ab603e9b7274a1155912fd6d0954111eee02a32e0d73be844fe73537' 
  AND token = '6zUO6S2jmZuDvqZeY5Bp6wP8zhBKjzDCx28MbU124Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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