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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d28d139471d50a97d9efaf173f7b05b486c82e6666659b37789acb7a42751b' 
  AND token = 'ae0Y83Rp9lSatxLuh9/H9sTA8jZLdBo1Zxa9wthJpzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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