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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47ee1fe30fb88c89dee0d472b716fbb7f1b8484f40f6c5788d37d050efb44cc' 
  AND token = '91eCgC2qbpOfQPo6Lhg2TBB0b8lhYHRyty2+9pjEIq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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