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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84299292d61614684b5d67663a5278ce120f913dbfed5ddf3827dc317c341df' 
  AND token = 'Xc2ty66GzHeFErwTMiRu+ORGMavMBLEdHb92sPq3zUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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