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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3e904addb6c1b1ea5f8764212809c6dabc721c6f829072d29d80cd1aaa99f6' 
  AND token = 'q2RrjGxdyK/sF/mIbe3I30yBvHSYRrj/NoRez8TUGcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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