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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36eebc72cda503e292f2d707e49789f94874da89629ebd33878d8426d37f44d7' 
  AND token = 'UOrvemq13GVGIFUJUvVQ+YdU4mLRc1DaO7KAkUeYZrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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