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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11602e706e6a3bf5338e5bc5da7794adbb3db5d689637bf3f6b9798d4c6336e2' 
  AND token = 'mvvzF7sEhY/wcuS5cGTU6kKSegU7UeY7XUwvZOddH/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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