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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e211dffcd051cbbc63041b82ee7acb345bc8d0670f970a95c1d33ffddd1c9b' 
  AND token = 'NOj5ozed5SDcU5OQ6dn79upZo4F6zpDJMN98CwYTTac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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