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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc03056917a6ad72cb0d8f443a069644eb3bf8331f2f37dbd596fd4937ee97cb' 
  AND token = 'yurtIdB766tzcZiwOLRkpppq/UQZGyPwm00PePA8sIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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