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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cbbc1096a44f29af8114d99b777b71ea2208f6071b5f117142e449c58c95152' 
  AND token = 'pPZCnIKTvXscGBGWBHArqB2UW6kSupA7t0CA5V/3zoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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