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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1aee9f8aa7d29ef01f6965b6a18880144d9259633cb08702bb1b398571129e6' 
  AND token = 'Oo42hHwObu5671tUyqUGbxi4/IwLgl40sCfpdR+mWOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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