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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c000ba655c765e647ba4af1a7eb74ba1ba654373ca602167f0ece77fb20fdd77' 
  AND token = 'av6K0iyyy5u4+MyD+5esjB1SNa7GPXgyiUnetj3Pggs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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