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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95373fd295a4b778621ef543715856a32bddf0355efbbf7474a155acf0017864' 
  AND token = 'Ac483AKMs0dVDtQRINR8ADuuAEdE3TB24GRftGnadaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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