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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f677a4c8dcc0c91c53fbabaeede7714b4fa3bf5c11ff67d1733c1c4b4d58e0f' 
  AND token = 'BDTzNg3HRE6hCY5HRWTVzmj0uPTyBdf3wbhFjS7fkOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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