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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9621979d85624a71e6fc2d87eb346c75a3153695a9a19e8079685b4fb517987d' 
  AND token = 'bwuImDrCld/TCTgWQ2lCuGc1m2ypj6IaksKAPKVUErI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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