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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3510f0353ab7386f0bda1c4d52e0641782888278b744abd43a789d5e6fd7a3e1' 
  AND token = 'mL8zfTXqaYmKtZG0Q+1+Te+/YVj93bkob+bwNQR04TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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