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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635be0019edf639af53deec8c4d9216cb6b73e1658480e6eb9e9de87ae51fe5c' 
  AND token = 'qaEXEgA3zwShA0zlrjKTRuhSBlSoQoQNEE/NduSXrlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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