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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa408b796ccfca1fb4a5f7919155212262a6323ac478acb911dfe7c2a56b09b5' 
  AND token = 'INActofTdUDEhREp47f8dVwztucteOHXeNOS47Nl63I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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