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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82624109bb90af462eae5b3be0c0f212aaa86a0b5e3e99ec6cae0a7a6b575d6' 
  AND token = '31QpJaz8dYUikliAIsA63L8HD2ND/6MSiknPgl7Sr/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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