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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e908cc9fee99062a5dfba5871d6aa5d17305c2616e93c824ae699c8bcab627e' 
  AND token = 'QZ7cbWtc647hT/4K1Skwr4I64EBM/zXE6Qa6cUqoXwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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