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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03702df1a5e71f9aa23d4ccb2622fd40ae7ef4a70cf7b7ee2a6c1c7fa194db1e' 
  AND token = 'LLzcVZw4feev7OCboz24kggPLT/1zTCuob3mIcgk65E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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