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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc554253f705f6f0ea0735d372ca2c50a7fb9b7e4572d1174eb5d659df87d0c3' 
  AND token = 'Q8kx6rS/THBX1Kdug7CddTlWtQ6peIPbYsEaucFULqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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