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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b115afb5589acc415fb554a3b16d505ffae34312907003e2fc8d9ac82e7f156' 
  AND token = 'exnMBugIGlw86wiPVIe2AWYhv08WnXnOyV0oEJXfUB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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