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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea316effcaf8889799ef55e2f1b246cd29e42950e04f37e997cde14bd5307a3' 
  AND token = '7roPfiKXPUsuAt84qmtK1zwH3xlLUYQC++XJ70Y4kMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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