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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe7f5b2836df9c8dc6e339e20316153cbfd89a4986e70fe9c7a0e42e046f0de' 
  AND token = 'LiT4Z3V0DEt1QU8r6HbA/gYNDF3MDzxlM6OVximBmag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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