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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b9047ed05d96449d6254f09462b986b7b5fdcfbaf3c9b2a155a17215118436' 
  AND token = 't+QALLD7ElQHdHkA7lgbxeXggP53nSgOz+6g4KTwkmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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