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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba69c3664cbf69ce45f1d9e0b517dcd0509eb233d2b3d2747d4422331c6c470' 
  AND token = 'bcJoTBi/kQkK9mZ4bI3wNfiAdHNfDNaWqBhOdZV082M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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