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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9a2e6449ce971387ba6bccd125f9bcabf0707d7adb96ae3f400d3887a17db4' 
  AND token = 'u54ulrCU+U3CC8sC/3l1q81aVq15zCnv514B+jFNDg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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