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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87334b262d50ab477db5c413582f18edadb9e361d48d0624d194ac9380744685' 
  AND token = 'scetgcgisg5RAokUgKsur4870/T5ff0k54aRdJ14Bcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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