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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ad1f77c20400dd764a19d96e75477a94d4f1bdfa81e49e9f7f32c3ceb97fc6' 
  AND token = 'zRxGIfj95+RAUrFEx8gzi+iFeZHtYznozOaW1HkMCnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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