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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e701a790a0194f13441722595e552f353b25ec6935bb4636d9879954c3bf47' 
  AND token = 'PI1dwXn1bK102b5wvXZNlXHKbzsSpjsBr3tAE/g3XLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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