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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403e42f3ef3d8437da5a561c2129e7539720aec59a63a487447ac9ed19229be8' 
  AND token = 'Ca5/SsiOLTSKasmlyUBDjisAUvzuSdFU/hWc1abwhp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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